用LA-MC-ICP-MS对岩石形成型阿帕石中Sr同位素的高空间分辨率 (10-50μm) 分析
Anda Buzenchi1, Hugo Moreira1, Olivier Bruguier1
1Géosciences Montpellier, CNRS & Université de Montpellier Bât 22 CC60, Place Eugene Bataillon 34095 Montpellier Cedex 5 France anda-ioana.buzenchi@umontpellier.fr.
Journal of analytical atomic spectrometry
|November 28, 2023
概括
这项研究引入了一种新方法,用于精确的in-situ (Sr) 同位素分析,使用激光除多采集器感应合等离子体质谱法 (LA-MC-ICP-MS). 开发的程序有效地纠正等离子干扰,使得高分辨率的Sr同位素测量.
科学领域:
- 地质化学 地质化学
- 分析化学 分析化学
- 同位素地质学的同位素.
背景情况:
- 通过LA-MC-ICP-MS进行的Sr同位素分析受到同位素干扰的阻碍.
- 准确和精确的同位素数据对于理解地质过程至关重要.
研究的目的:
- 开发和验证使用LA-MC-ICP-MS在阿帕中进行Sr同位素分析的新常规程序.
- 为应对与等离子干扰相关的挑战,并优化数据减少方案.
- 为了实现高空间分辨率 (低至10微米) 在Sr同位素测量在阿帕蒂特.
主要方法:
- 使用了一台热科学海王星XTMC-ICP-MS与193nm激光消光系统相结合.
- 在溶解和Sr净化后分析了五个具有不同REE/Sr比率的阿帕标准.
- 优化了仪器设置,并开发了两种数据减少方法 (方法1和方法2),以纠正干扰.
主要成果:
- 方法2对多次同位素干扰进行校正,达到~100 ppm (2 s.e.) 的精度. 对于具有50μm光束的87Sr/86Sr比率.
- 当干扰最小时 (Yb++低于LOD),方法1提供了更高的精度 (10微米时3000ppm).
- 该研究表明,能够在apatite.中进行高分辨率 (低至10微米) 的Sr同位素分析.
结论:
- 提出的常规程序提供了一个强大的和可靠的方法来LA-MC-ICP-MS分析Sr同位素在apatite.
- 开发的数据减少方法有效地克服了以前技术的局限性.
- 这一进步使得能够在高空间分辨率下进行准确的Sr同位素测量,从而增强地质解释.
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